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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Detachment of road surface soil by flowing water.
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Detachment of road surface soil by flowing water.

机译：通过流动的水对路面土壤的分离。

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摘要

An agricultural watershed generally consists of two land use categories, farmland and the unpaved road or path networks with different traffic frequency and size. Road surfaces are quite different from farmland soil in physical properties, resulting in it's distinguish production transportation process. Hydraulic flume experiments were conducted with the flow discharges ranging from 1 to 5 L s-1 and the slope gradients ranging from 8.8% to 46.6% to simulate the soil detachment process on a road surface and to develop tools in order to calculate detachment rates occurring on that road surfaces. The results illustrate that road surfaces behave characteristically in the runoff detachment and sediment delivery process due to the difference in the bulk density and functions of agricultural soils. The soil detachment rate is closely related to flow depth, slope gradient and other hydraulic parameters such as shear stress, stream power and unit stream power. Multiple non-linear regression analyses indicate that detachment rates for all roads can be accurately predicted by power functions of flow depth and slope gradient. According to the experimental results, stream power was suggested as an indicator to estimate soil detachment rate instead of shear stress in soil erosion models. However, considering the simplicity and availability, power function of flow depth and slope gradient is also recommended to predict detachment rate on the road surfaces.
机译：农业流域通常包括两种土地利用类别，即农田和交通频率和交通量不同的未铺设道路或道路网络。路面的物理性质与农田土壤完全不同，因此可以区分生产运输过程。进行水力水槽实验，流量范围为1至5 L s -1 ，坡度梯度为8.8％至46.6％，以模拟路面上的土壤分离过程并开发工具为了计算在该路面上发生的脱离率。结果表明，由于堆积密度和农业土壤功能的差异，路面在径流分离和泥沙输送过程中表现出特征。土壤的脱离速率与流量深度，坡度和其他水力参数（如剪应力，水流功率和单位水流功率）密切相关。多个非线性回归分析表明，通过流量深度和坡度的幂函数可以准确预测所有道路的脱离率。根据实验结果，在土壤侵蚀模型中，建议使用水流功率作为估算土壤脱离速率的指标，而不是剪切应力。但是，考虑到简单性和可用性，还建议使用水深和坡度的幂函数来预测路面的脱离率。

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